Arrangement for heating the ink in the write head of an ink-jet printer

A device for heating of an ink in a write head for an ink-jet printer comprising

• a print head substrate;
• a plurality of ink channels for delivering ink droplets to a print substrate;
• a plurality of electrothermal convertor elements corresponding to the plurality of ink channels and disposed for delivering heat to ink flowing in said ink channels;
• a plurality of individual current feed lines corresponding to the plurality of electrothermal converter elements and furnished as electrical conductor paths for delivering electrical energy to the electrothermal converter elements and wherein the electrothermal converter elements and the conductor paths are generated in a single metallized layer on the print head substrate, wherein the plurality of individual current feed lines is subdivided into a number of groups, wherein said groups in turn are placed at a distance relative to each other defined by intermediate spaces between neighboring groups in the metallized layer;
• a large-face heating resistor having part sections disposed in said intermediate spaces in the metallized layer, wherein the part sections of the large-face heating resistor are electrically connected to each other and wherein the part sections of the heating resistor and the conductor paths are led to an edge region of the print head substrate and wherein the part sections of the heating resistor and the conductor paths are contacted at the edge region;
• an insulator layer covering jointly the electrothermal converter elements, the conductor paths and the large-face heating resistor;
• and
• the large face heating resistor serves as a heat source and simultaneously as a temperature sensor.